BS 476-7:1997 火焰表面延伸等級測試
BS 476-7: Fire tests on building materials and structures-Part 7 method of test to determine the classification of the surface spread of flame of products.
BS 476-7: 對建築材料和結構的著火試驗-第7部分：產品火焰表面延伸等級確定的測試方法。
BS 476-7:1997 測試方法
測試方法是在燃燒箱內點燃燒樣品，點燃源為燃氣輻射板及中型燃氣噴燈。輻射板的輻射強度在離75mm處為32.5kw/m2(表面) ，噴燈的火焰高75-100 mm，與輻射板在同一方向施加於試樣。
樣品暴露在輻射熱源板下10min。記錄1.5分鐘及10分鐘樣品的火焰傳播程度。測試結果分成4個等級，BS476-7 Class 1, Class 2, Class 3,Class 4，Class 4材料火災危險性很高，不允許用為建材。
BS 476-7:1997 火焰表面延伸等級評估
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Classification of spread of flame
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Classification
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Spread of flame at 1.5 min
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Final spread of flame (10 min)
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Limit (mm)
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Limit for one specimen in sample (mm)
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Limit (mm)
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Limit for one specimen in sample (mm)
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Class 1
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165
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165+25
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165
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165+25
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Class 2
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215
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215+25
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455
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455+45
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Class 3
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265
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265+25
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710
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710+75
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Class 4
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Exceeding the limits for class 3
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BS 476-7:1997 火焰表面延伸等級評估在BS 6853:1999標準中應用
BS 6853:1999 標準要求：火焰表面延伸等級評估，最差要求為Class 2，允許等級為Class 1或Class 2
BS 476 相關參考標準
BS 476: Fire tests on building materials and structures
BS 476-3:2004 external fire exposure roof test
BS 476-4:1970 Non-combustibility test for materials
BS 476-5:1979 Method of test of ignitability
BS 476-6:1989+A1:2009 Method of test for propagation for materials
BS 476-7:1997 Surface spread of flame test for material
BS 476-11:1982 Method for assessing the heat emission from building materials
BS 476-12:1991 Ignitability of products by direct flame impingement
BS 476-15:1992 Method for measuring heat release of products-cone calorimeter
BS 476-20:1987 Method for determination of the fire resistance of elements of construction (general principles)
BS 476-21:1987 Methods for determination of the fire resistance of loadbearing elements of construction
BS 476-22:1987 Methods for determination of the fire resistance of non-loadbearing elements of construction
BS 476: 建築材料及構件防火測試
BS 476-3:2004 室外屋頂的燃燒測試
BS 476-4:1970 材料不燃燒性測試
BS 476-5:1979 可燃性燃燒測試
BS 476-6:1989 製品火勢蔓延的試驗方法
BS 476-7:1997製品表面火勢蔓延的試驗和分級方法
BS 476-11:1982建築材料熱輻射性能測試方法
BS 476-12:1991產品直接火焰衝擊的可燃性測試方法
BS 476-15:1992產品放熱性測試-錐形量熱儀
BS 476-20:1987建築構件耐火的測定方法(一般原理)
BS 476-21:1987 承重構件耐火的測定方法
BS 476-22:1987非承重建築構件耐火性能測試方法
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